`ptx': Produce permuted indexes =============================== `ptx' reads a text file and essentially produces a permuted index, with each keyword in its context. The calling sketch is either one of: ptx [OPTION ...] [FILE ...] ptx -G [OPTION ...] [INPUT [OUTPUT]] The `-G' (or its equivalent: `--traditional') option disables all GNU extensions and revert to traditional mode, thus introducing some limitations, and changes several of the program's default option values. When `-G' is not specified, GNU extensions are always enabled. GNU extensions to `ptx' are documented wherever appropriate in this document. For the full list, see Note: Compatibility in ptx. Individual options are explained in incoming sections. When GNU extensions are enabled, there may be zero, one or several FILE after the options. If there is no FILE, the program reads the standard input. If there is one or several FILE, they give the name of input files which are all read in turn, as if all the input files were concatenated. However, there is a full contextual break between each file and, when automatic referencing is requested, file names and line numbers refer to individual text input files. In all cases, the program produces the permuted index onto the standard output. When GNU extensions are _not_ enabled, that is, when the program operates in traditional mode, there may be zero, one or two parameters besides the options. If there is no parameters, the program reads the standard input and produces the permuted index onto the standard output. If there is only one parameter, it names the text INPUT to be read instead of the standard input. If two parameters are given, they give respectively the name of the INPUT file to read and the name of the OUTPUT file to produce. _Be very careful_ to note that, in this case, the contents of file given by the second parameter is destroyed. This behaviour is dictated only by System V `ptx' compatibility, because GNU Standards discourage output parameters not introduced by an option. Note that for _any_ file named as the value of an option or as an input text file, a single dash `-' may be used, in which case standard input is assumed. However, it would not make sense to use this convention more than once per program invocation.
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